., even tempur-pedic mattress sets save even more on floor samples, demonstrators, and closeout inventory. the year end clearance sale ends sunday at sleep train. ♪ your ticket to a better night's sleep ♪ >>> that's all for us tonight. tomorrow night, tony robins here to talk about keeping america great. "anderson cooper" starts right now. good evening, everyone. a truly remarkable story tonight. it could have been another newtown, connecticut. a confessed teenage killer, investigators say intent on causing a massacre, but he stopped short. that's where our story begins tonight. story straight ahead. >>> and later, how manti te'o explained the girlfriend who never was and his statements about her after he knew she was fictitious. you might have seen the interview. we'll speak to a pair of reporters. >> we begin as we do every night, keeping them honest, looking for facts, not looking for opinions or playing favorite, not supporting democrats or republicans. you can find that elsewhere. just looking at reporting. real reporting looking for the truth, calling out hypocrisy. so tonight,